[radvd-devel-l] Decreasing default AdvValidLifetime and AdvPreferredLifetime

Pekka Savola pekkas at netcore.fi
Mon Mar 31 05:39:17 EDT 2008

On Tue, 30 Oct 2007, Pekka Savola wrote:
> Quite often I've seen that a wrong prefix gets announced by accident or radvd 
> starts up in an interface that wasn't intended.
> Radvd's defaults for Adv{Valid,Preferred}Lifetimes (31 and 7 days, 
> respectively) exacerbate this problem.  On the other hand, a long lifetime is 
> only useful in a) bandwidth saving scenarios (where the setting can be 
> tuned), and b) if a router would go down for a longer period than 
> Valid/Preferred lifetime and you'd want to keep on-link communication with 
> the subnet prefixes working.
> Unless I hear objections, I'm going to significantly lower these values, 
> e.g., to 4 and 2 hours, respectively.

I forgot about this doing this.  The values above seem a bit too 
strict to be safe as defaults.  Instead, I've lowered the default 
values to 1 day and 4 hours, respectively.

Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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